题干
读下面的表格，判断句子。对的写正确，错的写错误。
classroom(s) | library(ies) | teachers' office(s) | playground(s) | toilet(s) | |
Ann's school | 24 | 1 | 5 | 1 | 8 |
Tim's school | 28 | 2 | 6 | 1 | 10 |
读下面的表格，判断句子。对的写正确，错的写错误。
classroom(s) | library(ies) | teachers' office(s) | playground(s) | toilet(s) | |
Ann's school | 24 | 1 | 5 | 1 | 8 |
Tim's school | 28 | 2 | 6 | 1 | 10 |
是简易净水器示意图，净水器中的石子、细沙、纱布、棉 
花的作用是( )